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Weighing down Aluminum?

I've been working on a sculpture made out of .080 aluminum and I need to weigh down the base somehow so it is stable.

It is crescent shaped cylinder so space is a little difficult. If there was something I could pour in that would be great. I thought about buying some workout weights and suspending them within the shape with string and then filling the void with an expandable two part form to act as an insulator to prevent the cast iron from touching the aluminum.

I'd love to just pour in some concrete but I've been reading bad things about AL and concrete. Sand has been suggested but would it hold moisture? The sculpture is going to be indoors.

What would I be able to use without having to worry about corrosion or problems down the road?

As soon as started reading this my thought was pour some led in it. Not sure about reactions between the two metals. Ask around at some tire shops maybe theyhave some old wheel weights that you can have.

Use lead. It won't hurt the aluminum. And you don't want to use concrete either it has lye in it and will corrode the aluminum. Lye is what the anodizing shops use to strip the anodize off the aluminum part.
Kerry

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you might look at shot-gun pellets. you can buy them for reloading in small but heavy bags. fairly cheap and lots of wait. that would keep you from having to melt anything, just have to seal it up some how after. maybe some of the foam.
most gun or sporting places with gun's should have them.

thanks for the help
......or..........
hope i helped feel free to shoot me an e-mail direct i have time to chat.james@newyorkmetalart.comsummer is here, plant a tree. if you don't have space or time to plant one sponsor some one else to plant one for you. a tree is an investment in our planet, help it out.
JAMES

you might look at shot-gun pellets. you can buy them for reloading in small but heavy bags. fairly cheap and lots of wait. that would keep you from having to melt anything, just have to seal it up some how after. maybe some of the foam.
most gun or sporting places with gun's should have them.